Structural health monitoring of metal components: A new approach based on electrochemical measurements

摘要: Corrosion fatigue is defined as the sequential stages of metal damage that evolve with accumulated load cycling, in an aggressive environment, and resulting from interaction irreversible cyclic plastic deformation localized chemical or electrochemical reactions. It appears then evident need to know understand all phenomena are involved pit formation growth presence both environment a load. Although each single effect corrosion have been extensively documented for aluminium alloys, their synergic action not thoroughly understood it continues be area considerable scientific industrial interest. Fatigue experiments were conducted on bare AA 2024 T3 alloy specimens consisting water aerated solution 3.5% NaCl weight. The specimen was stressed four-point bending test; upper surface specimen, experiencing only tensile stress, monitored one. True strain this by means fibre optic Bragg grating. open circuit potential variations observed function number cycles interpreted result, taking into account numerous complex occurring time goes on. pits birth subsequent seem play significant role crack initiation propagation up final catastrophic failure. This has verified also finite element method analysis. Copyright © 2012 John Wiley & Sons, Ltd.